<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>边框与圆角</title>
    <style>
        *{padding: 0;
          margin: 0;}
        div.xiang{
            width: 300px;
            height: 300px;
            border: 2px solid black;
            border-radius: 20px 10px 60px 10px;
            margin-bottom: 50px;
        }
        .gu{
            width: 0;
            height: 0;
            border: 200px solid;
            border-color: transparent;
            border-left-color: blue;
            border-radius: 50px;
        }
        .rui{
            width: 0;
            height: 0;
            border: 200px solid;
            border-color: transparent;
            border-right-color: red;
            border-radius: 50px;
            position: relative;
            top: -400px;
            left: -50px;
        }
    </style>
</head>
<body>
    <div class="xiang"></div>
    <div  class="gu"></div>
    <div class="rui"></div>
</body>
</html>